Each year, seasonal flu sickens about 1 billion people worldwide and causes approximately 290,000 to 650,000 respiratory ...

The air sac system is a vital part of the avian respiratory system. Air sacs are thin-walled structures, one to two cell layers thick, that extend throughout the body cavity and into the wing and ...

it could mean their respiratory system is struggling. A nagging cough—it doesn’t matter if it’s dry or phlegmy—is never normal for dogs. Bird flu can attack the lungs and lead to ...